Brahma-gayatri
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 25.143-144, Translation and Purport:
“"The meaning of the Vedānta-sūtra is present in Śrīmad-Bhāgavatam. The full purport of the Mahābhārata is also there. The commentary of the Brahma-gāyatrī is also there and fully expanded with all Vedic knowledge. Śrīmad-Bhāgavatam is the supreme Purāṇa, and it was compiled by the Supreme Personality of Godhead in His incarnation as Vyāsadeva. There are twelve cantos, 335 chapters and eighteen thousand verses."
This is a quotation from the Garuḍa Purāṇa.
CC Madhya 25.147, Translation:
“In the beginning of Śrīmad-Bhāgavatam there is an explanation of the Brahma-gāyatrī mantra. "The Absolute Truth (satyaṁ param)" indicates the relationship, and "we meditate (dhīmahi) on Him" indicates the execution of devotional service and the ultimate goal of life.